更新RM

README.md

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 <p align="center">
-    <a href="http://www.xuxueli.com/xxl-job/">
     <img src="https://raw.githubusercontent.com/xuxueli/xxl-job/master/doc/images/xxl-logo.jpg" width="150">
-    </a>
     <h3 align="center">XXL-JOB</h3>
     <p align="center">
         XXL-JOB, a lightweight distributed task scheduling framework.